Nine Illinois couples filed a lawsuit this week, backed by the American Civil Liberties Union and New York-based Lambda Legal, to challenge the constitutionality of Illinois law that bars same-sex couples from marrying. Led by lead plaintiffs Tanya Lazaro, a Chicago Police Department Detective, and her partner Elizabeth Matos, a system analyst for a trading firm in the Loop, the ACLU group filed a complaint against Cook County Clerk David Orr "ask[ing] this Court to perform what is perhaps its most solemn and sacred duty--ensuring that fundamental rights are extended to all Illinoisans," according to the document.